Force pump



March 19, 1929. A, G, NORTON 1,706,315

FORCE PUMP Filed March 24, 1928 /il i z'n ATTORNEY Patented Mar. 19,1929.

narran STATES PATENT OFFICE.

.ARTHUR G. NORTON, OF HOLLEY, NEW YORK, ASSIGNOR T ALERT PRODUCTS NC.,OF HOLLEY, NEW YORK, A CORPORATION OF NEVI' YORK.

ronen PUMP.

Application flied March 24, 192e. sei-iai No. seines.

The present invention relates to torce pumps and more particularly tothe type in which the cylinder ot the pump has a 'flexible sealing cupsecured one end tor forming a sealed connection with the object on whichthe pump is used. An object ot this invention is to provide aneti'ective means for securing the sealing cup to the cylinder ot thepump. Another object oit the invention is to utilize the sealing cup forincreasing the pressure created by the pump.

To these and other ends7 the invention consists of certain parts andcombinations of parts all of which will be hereinafter described: thenovel features being pointed out in the appended claims.

In the drawings:

Fig. 1 is a view in elevation of a pump constructed in accordance withthis invention;

Fig. 2 is an enlarged fragmentary sectional view of the pump cylinderand the sealing CUPS F ig. 3 is a bottom view of the sealing cup, and

Fig. 4 is a fragmentary perspective view of the lower end of the pump.

In the illustrated embodiment of the in! vention, l indicates thecylinder and 2 the 00 4i. rlhe cylinder, in this instance, is a metaltube open at its lower end which bends or curves outwardly in thedirection ot the cylinder to provide an annular curved rib 5.

rhe sealing cup 6 has a sleeve 7v at one end which is separated from thechamber ot the cup by a partition 8 formed with a central opening 9 thediameter of which is relatively smaller than that of the cylinder 2. Intitting the sealing cup to the cylindera the sleeve 7 is stretched orexpanded, from an internal diameter materially less than that ot theexternal diameter of the cylinder and. after such expansion it is fittedto the cylinder so that the end ot the cylinder abuts the partition 8.WVhen the sleeve is released7 trom the pump.

piston movable therein through the handlev it contracts into binding`engagement with the outer surface of the cylinder and the rib 5 becomesimbedded in the material et the sleeve adjacent the partition 8 so thatthe sealing cup held against movement in one direction by the curvedannular rib or flange 5 as well as by the tight rictional en- `gageinentbetween the sleeve and the cylinder 2, and, in the other direction, bythe abutment ot the lower end of the cylinder against the partition 8.The small opening 9 has the effect ot increasing the air pressurecreated by the piston 2.

From the foregoing, it will be seen that there has been provided aconstruction in which the sealing cup is effectively held to thecylinder against movement in both directions and at the same time it hasa partition which creates greater air pressure Further, the partition 8acts as a stop for the piston and prevents the latter mari-ing orinjuring any parts on which the tool is being used.

What claim as invention and desire to secure by Letters Patent is: f

l. A force pump comprising in combination a cylinder open at one end andprovided with a rib around such open end, a piston movable in the clinder and a sealing cup having a sleeve, a partition between the sleeveand kthe chamber in the cup abutting the lower end ot the cylinder, therib of the cylinder vbeing imbedded in the material of the sleeveadjacent such partition.

2. A force pump comprising in combination a cylinder, a piston movablein thek cylinder, and a sealing cup having a sleeve litting on thecylinder and also having a partition abutting the end ot the cylinderand arranged between the sleeve and the chamber of the cup, saidpartition having an opening of smaller area than the internal diameterof the cylinder so as to increase the pressure ot the air delivered bythe cylinder to the chamber of 'the cup..

ARTHUR G. NORTON.

